Senior Frontend Engineer

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Frontend Engineer in Spain.
You will join a fast-growing product engineering environment focused on building scalable, high-performance frontend systems for modern SaaS infrastructure. In this role, you will take ownership of a complex frontend application used by high-profile companies and contribute directly to the evolution of a critical developer-facing product. You will work closely with Product and Backend Engineering teams to design, build, and ship robust features that combine usability, performance, and long-term maintainability. The environment is highly autonomous and requires strong ownership, proactive decision-making, and the ability to navigate ambiguity. You will also play a key role in shaping frontend architecture, improving observability, and maintaining design system consistency across the platform. This is a high-impact role for an experienced engineer who thrives in fast-paced, technically demanding, and collaborative product teams.

Accountabilities:

• Own and evolve a complex frontend application, ensuring high standards of performance, reliability, scalability, and usability across all features.


• Collaborate with Product and Backend Engineering teams to design and implement new features from concept through to production delivery.


• Build, maintain, and scale a robust design system to ensure UI consistency and efficient development across the product.


• Improve frontend observability by implementing monitoring, logging, and debugging practices to proactively identify and resolve issues.


• Drive frontend architecture decisions, ensuring long-term maintainability and technical excellence.


• Work autonomously in a fast-paced environment, taking full ownership of tasks and delivering them end-to-end.


• Contribute to continuous improvement of engineering practices, code quality, and development workflows.

Requirements

• 5+ years of professional experience in frontend engineering with strong expertise in modern JavaScript frameworks.


• Expert-level proficiency in React and its ecosystem.


• Proven experience building and scaling design systems in production environments.


• Strong understanding of frontend performance optimization, monitoring, and observability practices.


• Comfortable working in autonomous, fast-moving, and ambiguous environments.


• Strong communication skills, with the ability to collaborate effectively across Product, Engineering, and Design teams.


• Ownership-driven mindset with a proactive and solution-oriented approach.


• Commitment to high-quality engineering, including maintainability, scalability, and performance.

Nice to have:

• Experience with GraphQL.


• Exposure to developer tools, infrastructure products, or open-source ecosystems.


• Background in fintech, billing systems, or data-intensive frontend applications.


• Contributions to or participation in open-source projects.

Benefits

• Competitive salary ranging from €60,000 to €90,000 per year.


• Stock options as part of the compensation package.


• Fully remote work across Europe.


• Opportunity to work on a widely adopted open-source billing platform used by leading global companies.


• High level of autonomy and ownership over core frontend systems.


• Collaborative, high-performance engineering culture focused on excellence and continuous improvement.


• Exposure to complex, large-scale SaaS and fintech-related technical challenges.


• Opportunity to shape the frontend of a fast-scaling developer-first product.

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